Water-tight cement and process of producing the same.



UUH I IN UH I'LHO l lb- (W UNITED STATES PATENT OFFICE.

ASMUS MATTHIAS HEINRICH HANSEN AND MARTIN CHRISTIAN JOHANNES NEVE, OF HAMBURG, GERMANY.

WATER-TIGHT CEMENT AND PROCESS OF PRODUCING THE SAME.

No Drawing.

To all whom it may concern:

Be it known that we, ASMUS MATI'HIAS HEINRICH HANSEN and MARTIN GHRIs'rIAN JOHANNES Nave, subjects of the King of Prussia, residing at 3 Ober-Bergfelde and 1 Treskowstrasse, Hamburg, Germany, have invented a new and useful Improved VVater- Tight Cement and Process of Producing the Same; and we do hereby declare the following to be a full, clear, and exact description of the invention.

Our invention relates to an improved process of producin a water-tight cement.

Numerous proposa s have been made with a view to making a cement which is watertight and will be free from exudations. Many of such proposals are referred to in patent literature. In most cases the intention has been to impregnate the burnt mass of cement, before being ground up and either while yet warm or when already cold, with some suitable liquid and so to obtain, after drying and grinding, a cement powder which will be suitable not only for making an artificial stone unafiected by and impermeable to water, but chiefly for dressing, building and concreting without the necessity of employing coatings of asphalt or adopting other means to obtain imperviousness. For example, it is claimed that the above purpose has been successfully accomplished in practice by the treatment of Portland cement with soda, potash, parafiin, ozocerite, mixtures of potassium stearate and colophony, bitumen or the like. For use in making plaster, mortar and many mixtures for artificial stones there have been proposed oils, fats, varieties of wax, soaps, gum and so on. Experience has however proved that the benefits claimed in such mixtures are in most cases not obtained or, if they are, only at the expense of other valuable qualities, e. g. binding-qualities.

A primary object of our invention is to produce a hydraulic cement which is really water-tight, and which can be efi'ectively produced in a simple manner without in any way prejudicing the excellence of the other qualities of the cement. To this end, we

epare in the following manner a mixture, w according to our experiments, is preferably oportioned as stated :40 parts of fish-oil an parts of liqpochloric acig are 01 e together. In a 1 ion pa s of Specification of Letters Patent.

Patented Nov. 21, 1916.

Application filed January 23, 1918. Serial No. 743,761.

3 to 4%; is added to the cemspp clinkir g5 (especia ly of the kind 0 so ca e or land cement) to be ground, and the entixe.

mixture is thenagmuudwun The sit ted roduct furnishes a hydraulic cement which is completely water-tight.

Changes in the proportions of the constituents employed in the mixture, and in the manner in which the process is carried out may be made; such changes can be made to suit the quality of the cement employed and to suit the desired requirements of the product. Instead of fish-oil other fats or oils may be employed, and any other acid can be used in connection with it.

Ve claim 1. A process of producing a wate tight cement, consisting in first re arin a mixtpre of an animal oil, hv rochloric acid in then addin this mixture to cement, in mixin the w o e o e er an WW 2. Ihe herein described process of producing a water-proof cement which consists in first preparing a mixture of a fat, hydrochloric acid and lime, and subsequently adding this mixture to cement, mixing the whole together and finely grinding the whole.

3. A process of producing a water-tight cement, consisting in boiling an animal oil with hydrochloric acid, in adding the warm mixture so obtained to lime while being slaked, in allowing the paste so formed to dry in adding the dried paste to cement clin (er, and in finely grindlng the whole.

4. A process of producing a water-tight cement, consisting in boiling forty parts of fish-oil with ten parts of hydrochloric acid, in adding the warm mixture so obtained to two hundred parts burnt lime while being slaked in three hundred parts water, in al lowing the paste so formed to dry, in adding the dried paste to cement clinker, and in finely grinding the whole.

5. In the process of producing a water- 55 buapt lime are slaked in 300 parts of tg; tight cement, the step consisting in boil- 8. A process of producing a water-tight 15 cement, consisting in first preparing a mix ture of a fat, inorganic acid and lime, then adding this mixture to cement, then mixing the whole together, and then finally grinding the whole. 20

In testimony that We claim the foregoing as our invention, we have signed our names in presence of two subscribing witnesses.

ASMUS MATTHIAS HEINRICH HANSEN. MARTIN CHRISTIAN JOHANNES NEVE.

Witnesses:

ERNEST H. L. MUMMENHOFF, KARL GEHWAUDKY.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents. Washington, D. 0. 

